Трение и износ, 2005, Vol.26, No.5
/ Издания академии / Научные журналы
Трение и износ, 2005, Vol.26, No.5
Том 26, номер 5; сентябрь-октябрь, 2005
СОДЕРЖАНИЕ
СТАТЬИ
Kravchuk A. S., Chigarev A. V., Butso R., Valbusa U.
Penetration of the elastic roughness into the thick plastic coating. pp. 455--459
Summary: Effect of elastic deformation of a roughness to a depth of its penetration into a thick plastic coating was investigated. The share of plastically penetrated asperities in the total number of asperities interacting with a coating was determined. Approximation of a relative profile of a rough surface by power function in the system of coordinates connected to the highest asperity was used. It is supposed that the coating has sufficient thickness and can be replaced with a rigid plastic half-space. It was established that application of rigid model is wrongful in case of small loads when the significant part of asperities does not penetrate plastically.
Krasnyuk P. P.
Contact of rigid half-cylindrical punch with elastic layer at non-stationary friction heat generation. pp. 460--470
Summary: The quasi-static contact problem of thermo-elasticity for tribosystem consisting of elastic layer fixed to the foundation is considered. Rigid, heat-insulated punch of half-cylindrical shape moves over the layer surface. Given this, the interaction of the bodies is accompanied by the heat generation due to friction forces following the Amontons law. Under the assumption that the heat generation is the non-stationary process the problem was resulted in the system of two integral equations with time-dependent limits of integration. The algorithm of the numerical solution of these equations was proposed and effects of change in the contact pressure and area were considered at variation in pressing force and speed. It was shown that the increase in intensity of a heat generation causes reduction of the punch penetration and the balance is possible at its negative values when reduction of a contact area is observed.
Shevelya V. V., Oleksandrenko V. P.
Dissipative properties of frictional contact with consideration of processes of mechanical and tribochemical relaxation. pp. 471--480
Summary: Mechanical and chemical mechanisms of dissipation of mechanical energy input during friction were considered in connection with wear resistance of a material. Effect of sliding speed as well as of slip amplitude at fretting-process on wear resistance of pair friction in medium with various oxidizing ability was investigated at the unidirectional friction. The wear model, which allows one to track the interrelation between proceeding tribochemical processes, internal friction (relaxation properties) of material and its wear resistance, was considered. It was shown that rheological (relaxation) properties of surface layers of pair friction predetermine the size of both mechanical and chemical components of wear. At a low level of internal friction a decrease in dynamic intensity of a material can be achieved by tribochemical mechanisms of a relaxation of peak stresses.
Gritsenko B. P.
Role of the acoustic oscillations generated by friction in fracture of tri bosystems. pp. 481--488
Summary: The analysis of fracture of steel 45 and a-iron at their test on friction and wear as well as of hard alloys at cutting was carried out. It was shown that the acoustic oscillations generated by tribosystem produce great effect on fracture of materials at friction.
Dzhanakhmedov A. Kh.
The analysis of wear of running pair of the valve in conditions of elastic-plastic deformation. pp. 489--496
Summary: The wear-contact problem on interaction of running pair (spindle -- nut), exposed to elastic-plastic deformation was considered. Analytical expressions for determination of parameters of elastic-plastic contact were derived. The rational choice of material for running pair a valve by criteria of wear resistance was carried out
Khachaturyan S. V., Turaev M. U., Negmatov S. S.
Prediction of relative wear resistance of rail steel by power intensity of material at plastic deformation. pp. 497--501
Summary: Analytical dependence for determination of the latent energy accumulated in a material at plastic deformation was derived. The opportunity of its application as criterion for an estimation of relative wear resistance of rail steel is considered. Validity of the suggested approach is proved by comparison of the calculated data with results of laboratory research and ground tests of rails.
Khrushchov M. M.
The estimation of degree of non-equilibrium of structure of tribo-technical coatings deposited by vacuum ionic - plasma sputtering. pp. 502--506
Summary: Under the assumption that thermodynamic nonequilibrium of structures of vacuum ionic-plasma coatings is mainly connected with thermal conditions of sputtering and partial ionization of sputtered stream the determining factors were considered. The degree of a deviation of structure from balance can be characterized by "the factor of nonequilibrium" a (analogue of factor of supersaturation) which depends on atomic properties of a coating, the total thermal flow generated on a substrate at condensation, sputtering rate, and technological temperature.
Pogrebnyak A. D., Kravchenko Yu. A., Alontseva D. L., Ruzimov Sh. M., PonaryadovV. V.
Structure and properties of the powder coatings deposited by the high-speed plasma jet. pp. 507--516
Summary: Using X-ray analysis (XRA), scanning electron microscopy (SEM) with the microanalysis, measurements of wear, nano- and microhardness the effect of surface fusing of powder coatings of AN-35 by the concentrated streams of energy (pulse streams of plasma) was investigated. Plasma-detonation deposition of a powder on a stainless steel substrate was accompanied by formation of the fusion-spliced surface structure whose basic elements are a (GP)- and b (GTsK) cobalt. The chosen temperature range of coating formation according to results of XRA promotes the formation of intermetallide compounds of cobalt with chrome of type CoxCry. At pulse-plasma fusion of surface of powder coatings occurs also alloying of a near-surface layer by atoms of molybdenum. It was revealed that the chosen methods and regimes of surface modifying promote significant reduction of wear and also increase of micro-and nanohardness. It was shown that substantial improvement of service characteristics is connected to processes of phase transformations in a powder in high-temperature plasma-detonation stream, pulse-plasma alloying of surface by atoms of molybdenum, redistribution of components of a coating, occurrence of micro- and nanogranular structures, and also with reduction of porosity of a coating under influence of thermal annealing by the concentrated streams of energy.
Khrushchov M. M.
The estimation of degree of non-equilibrium of structure of tribo-technical coatings deposited by vacuum ionic-plasma sputtering. pp. 517--520
Summary: The influence of the microhardness of vacuum-plasma coatings of different chemical composition on their wear resistance during friction in an aviation fuel medium has been investigated. An area of optimal values of microhardness has been found which corresponds to maximum wear resistance of coatings.
Kuznetsova T. A., Andreev M. A., Markova L. V.
Research of wear resistance of the combined vacuum electroarc coatings on the basis of ZrHf. pp. 521--529
Summary: Wear resistance of the protective coatings generated on the basis of alloy of ZrHf on substrates made of tool steel P6M5 was investigated. Coatings were deposited by a combination of eleetroarc evaporation and ionic nitriding. The wear was estimated by stylus method applied to the friction tracks received at reciprocal movement of the loaded indenter over a substrate. Morphology of the friction tracks was investigated by methods of scanning electron microscopy (SEM) in a combination with micro-X-ray analysis (MXRA) and atomic-force microscopy (AFM). The structure of the friction tracks characteristic of each type of a coating under certain conditions of indenter loading was revealed. It was shown that the secondary structure as the plastic layer smearing the surface defects during friction is formed as a result of influence of loading on a surface of the highly-resistant coatings. It was established that the highest wear resistance has the coaling of ZrHtN deposited by the combined technology, the following combination of its formation deposition of ZrHf sublayer including nitriding of a product with a sublayer in plasma of a pulsing current and formation ol'ZrHfN nitride on a nitrated surface is the condition of application of the combined coating with high wear resistance.
Basinyuk V. L., Kolomeichenko A. V., Kukareko V. A., Mardosevich E. I., Titov N. V.
Method of friction-mechanical formation of antifrictional coatings on Al2O3. pp. 530--538
Summary: Results of experimental research of friction-mechanical formation of antifrictional coatings on layer Al2O3 deposited by anode-cathode microarc processing on a surface of a part from an aluminum alloy were presented. The opportunity of realization of this process was shown at essentially smaller, in comparison with traditional, contact pressure by rise in temperature of a rubbing plate due to restriction in heat transfer from a zone of frictional contact.
Bakhshaliev V. I.
Determination of the friction moment of the main sliding bearing of the pislon machine underaction of variable load. pp. 539--545
Summary: The non-stationary plane problem on distribution of velocities of particles of a lubricant film between the crankshaft journal and the insert of the main sliding bearing under action of the periodic sine-shaped force characteristic of piston machines was considered and solved. On the basis of this solution the dependencies for determination of the friction moment and loading ability of sliding bearings were deduced using the hydrodynamic lubrication theory.
Podmasterev K. V., Mishin V. V., Markov V. V.
Electroresistive research of influence of errors in form of ring races on the condition of lubrication in the bearing. pp. 546--553
Summary: Results of theoretical and experimental research of influence of errors in form of rolling races of rings on a condition of a lubricant in the bearing were obtained by an electroresistive method. A number of diagnostic parameters were proved and the electroresistive method of diagnosing providing the solution of a problem of complex estimation of a condition of the bearing with an opportunity of revealing of a kind, an estimation, and orientation of a dominating errors in form of a rolling race of each of rings was developed.
Feldshtein E. E., Grebnev N. P., Kulbitskii V. E.
Topography of the processed surface at flat grinding of sintered antifriction materials. pp. 554--557
Summary: Effect of conditions of flat grinding on roughness parameters and topography of the processed surface of sintered antifriction materials based on iron and copper was considered. Effect of processing regimes and conditions of sparking-out on roughness parameters of the processed surface was established. The minimal surface roughness is observed at small depth of grinding and cross-feed and the maximal line feed of table. Correctly chosen conditions of grinding provide the presence of open clean pores on a surface of part.
ХРОНИКА. pp. 558--559
КАЛЕНДАРЬ КОНФЕРЕНЦИЙ. p. 560
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Created with assistance of Dr. Ignatii I. Korsak
Copyright © 2005, 2006 The National Academy of Sciences of Belarus
Copyright © 2005 The V.A.Biely Institute of Mechanics of Metal-Polymer Systems
